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Fix "combine" breaking dye mixes #6413

Job	Run time
docs / Build linux64	1m 20s
lint / lint	15s
test / Linux gcc-12 / Build linux64	2m 9s
test / Linux gcc-11 / Build linux64	1m 30s
test / Windows MSVC / Build win64	3m 55s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	56s
test / Run Linux test suite / Test (ubuntu, gcc-11, default plugins, default config)	57s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 18s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 0s
	13m 20s

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